# Physics

posted by .

An object of mass 4.40 kg is projected into the air at a 55 degre angle. it hits the ground 3.8 s later. what is its change in momentum while it is in the air? ignore air resistance.

• Physics -

Impulse = M*g*(3.8 s), downward.
The launch angle and velocity are not needed for the answer, but they do determine when the object hits the ground. .

• Physics -

that doesn't work as the correct answer :/

• Physics -

The launch velocity is 22.73 m/s, with a vertical component of 18.6 m/s. It his the top of the trajectory at 18.6/g = 1.90 s and hits the ground at 3.80 s.

If you use my suggested method, you get
momentum change = 4.40 kg*9.8 m/s^2*3.8s
= 163.9 kg m/s

Initial vertical momentum =
4.4*sin55*22.73 = 81/93 kg*m/s

That gets double on the way dwn, for a net momentum change of 163.9 kg m/s

## Similar Questions

1. ### physics

a ball is projected with a speed of 20 m/s from a building toward a second building as shown. ignore air resistance and take g = 10 m/s. where does the ball hit and how long is it in the air if the initial angle is 45 degrees with …
2. ### physics

An object of mass 4.3 kg is projected into the air at a 45° angle. It hits the ground 3.8 s later. What is its change in momentum while it is in the air?
3. ### AP Physics B

An object of mass 3.2 kg is allowed to fall from rest under the force of gravity for 3.5 s. What is the change in its momentum?
4. ### Physical science

An object is projected vertically upwards and returns to the point of projection 12s later. Ignore air resistance and determine the velocity with which it was projected?
5. ### physics

james made a very nice play on 13 hole on 2011 master's open. he made driver shot with initial velocity 200 m/s. the ball has a mass of 46g. its lunching angle is 28 degrees from the ground. draw the trajectory (x-y graph) with and …
6. ### physics

A rocket is fired straight up and accelerates upward at 24 m/s2 for 12 seconds. The rocket then runs out of fuel and coasts. Ignore any air resistance effects and use -9.8 m/s2 for the local acceleration due to gravity. a) What is …
7. ### Physics

An airplane is flying horizontally with a constant velocity of 160 m/s at an altitude of 5100 m when it releases a package. a. How long does it take for the package to reach the ground?
8. ### Physics

A powerful motorcycle can produce an acceleration of 3.5 m/s2 while traveling at 90 km/h. At that speed the forces resisting motion, including friction and air resistance, total 400 N. (Air resistance is analogous to air friction. …
9. ### Physics

An object of 3.0kg is projected into the air at a 55 degree angle. It hits the ground 3.4s later. What is it's change in momentum while it's in the air?